A METHOD FOR CONTROLLING A POWER SPLIT CONTINUOUSLY VARIABLE TRANSMISSION AND A POWER SPLIT CONTINUOUSLY VARIABLE TRANSMISSION

摘要

A power split continuously variable transmission including a variator unit having a first and a second variable displacement hydrostatic machine and a planetary gear unit, characterized in that said power split continuously variable transmission is arranged to be controlled to perform a simultaneous reduction of displacements of said first and second variable displacement hydrostatic machines during at least a part of a lock up state of the power split continuously variable transmission, and a method of operating such a transmission.